Mich. Comp. Laws § 768.30

Sec. 30. It shall not be necessary in any criminal suit, action or proceeding in any court of record, to except to the charge given to the jury, or to the refusal to give any charge requested by either of the parties to such suit, action or proceeding, but any party aggrieved by any such charge or refusal to charge, may assign error upon such charge or refusal to charge in his assignments of error, the same as if exception had been made to such charge or refusal to charge.